Noise cancellation is more effective at lower frequencies, but reduces most external sound.
Noise cancelling headphones can be purchased online at Amazon. They can range in price from $10 to well over $100. Another option would be a local sporting goods store.
The prices on noise-canceling headphones can range from $20 to over $300, depending on the quality you want. Stores like Walmart and Target have headphones on both ends of the scale.
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The frequency range of JVC headphones will vary dependent on which JVC product is brought. They do come as high as 26 kHz which is true of the JVC HA-S650. However, you can buy JVC headphones with a much lower frequency.
The phrase, "best headphones," is very subjective, in the sense that a lot of factors go into headphones. If you care about the loudness/clarity of bass, The Beats by Dr. Dre are without a doubt the best. There is a large range of Beats audio, but the best are The Beats Pro (~400 USD). However, if you care about noise reduction/overall audio quality, I would say that the Bose Quiet Comfort 15 Acoustic Noise Cancelling Headphones (~300 USD) are the best headphones on the market.
There are a variety of brands that sell noise-cancelling earbuds, and the cost can vary greatly depending on which ones you choose. Some brands are Sony, Pioneer, and Panasonic. The prices of these earbuds range from about $17 to about $250. Here is some more information on noise-cancelling earbuds. http://www.noisecancellingearbuds.net/
White noise
"It doesn't seem that Bose makes very many styles of earbuds; however, one model sells for $99.95 on Amazon. Another model is available for $60 from a third-party seller."
Look for the dynamic range that they cover (Ex. 25 to 30kHz) Noise cancelling feature is another great feature - blocks out most all other room sounds. Basically, you do get what you pay for - although being pricey doesn't always assure the best quality.
There are different type of earphones in the Sony range. The Prestige In-ear headphones are available. There are different kinds of these headphones. There's regular, active sports, Bluetooth, and a small noise reduction earphone.
I believe the best place to have a large range of products to choice from is Best Buy. There they have informed employs to help you every step of the way.